Sellschaft



F. NOLTE.

ALTERNATING CURRENT RELAY. APPLICATION man APR. 1. 1916. RENEWED MAY 21.1919.

1 ,3 1 9,723 Patented Oct. 28, 1919.,

UNITED STATES PATENT ornicn FRITZ NOLTE, 0F BERLIN, GERMANY, ASSIGNOR T0 SIEMENS & HALSKE AKTIENGE- SELLSCHAFT, OF BERLIN,-GERMANY, A. CORPORATION OF GERMANY.

nmnanarrneomnnr RELAY.

Application filed April' 1, 1916, Serial No. 88,378. Renewed May 21,1919, Serial No. 298,776.

To all whom it may concerm Be'it known that I, Fnrrz Nom'n, a c1t1zen of the German Empire, and residing at Ber- U lin, Germany, have invented certain new and useful Improvements in Alternating-Curlays, energized by alternating current, forinfluencing local circuits in the following manner.- A local clrcult was led over a contact' member which was influenced by the armature of a relay and possessed such a littleperiodicity of vibrations that when the armature vibrated, the contact member was thrown upward and made contact at only relatively great intervalsfi A complete and constant interruption of the circuit can evidently not be obtained by such an arrangement. Another proposal was to employ several of such contact members, which, when contact is made, are connected in series over parts of the armature and are tuned to various periods, has also not proved entirely satisfactory under all circumstances, because in such an arrangement, although the..frequency with which contacts are 'made while the relay is energized, is very greatly reduced, such contacts arenevert eless possible. v v 1 According to the present invention, the

circuit to be supervised is carriedin Series through two or more contact devices whichare oontrolled'by the alternating current, so that as long as the latter is flowing, the circuit to be supervised is always interru ted by one or other of the contact devices. uitable contact devices can be formed by the armatures of two or more polarized relays," .which are suspended so as to hang toward one side. The arrangement is such that the one halfiwave of the alternating current removes the armature of the one relay (or the armatures of a group of relays) from the correspondinig fixed or stationary contact; the other hal the armature of the other-relay or the armatures of the other group from the correa spondin fixed or stationary contacts. Thus the loca or. supervised circuit is kept open constantly so'long as the alternating cur-o wave in a similar way removes ample in "the accompanying drawing, .showing one formv of the improved alternating current relay.

Specification of Letters Patent. Patented Oct, 28,1919; I

Referring to the drawing, it will be seen i that in series with the alternating current leads L are connected the windings w of two permanent or polarized magnets m on, having a south pole at each lower end and a north pole in the middle at the top, as

The armatures a a, of these magnets are suitably pivoted and are controlled by springs a or otherwise, so that they can readily oscillate under the action of the variations of magnetic effect due to the excitingalternating current.

The pivots of the tongues or armatures a a, are connected with-two poles ofn source of local current, through a working relay 1", and in their position of rest bear against two contacts is connected by a wire o, so thatwith the. armatures in this position, the local circuit-is completed.

In the position ofrest, viz, with n'ocur' rent in thealternatin circuit, the armatures a a, which are s lOWIl, may be under the influence of springs a lie against different' pole-pieces of the relay 'magnets, and

also against the two'vconta ts I: of the local circuit, so completing the latter.

As soon, however, as an alternating current flows through the windings w the one half wave will weaken one of the south poles and strengthen the other, in a similar manner in both magnet arrangements. Thus the-armature in contact with the strehgth-- 1 enedpole will retaini its position, whiletheother armature will be reversed, so that there 1s an interruption of the local circuit at the same.

The next half wave will effect a converse strengthening. and weakening of the south poles, so that both armatures 0,, a, are retakes "place at the other armature. As long therefore, as alternating current is flowing,

both amnatures are actuated synchronously in the same direction and they alternately serve to interrupt the local circuit, so that 7 the relay 7* can effect the desired operations versed and the interruption of the circuit 1 to its armature and north polarity on the contrary to the two free arms, the direction of winding of the alternating current coils being correspondingly reversed. Furthermore, the stationary contacts is may be arranged on the same side of the corresponding armatures, if in the onerelay magnet, the armature is of south polarity and in the other of north polarity. The pole windings would then be in the same direction.

The armatures might, however, be of the same polarity if the windings were arranged to exercise opposite magnetizing effects.

In the two latter cases the armatures in the position of rest and with no alternating current flow, assume corresponding positions or incline the same way.

The two relay magnets may be united in one. In this case, the Ushaped magnet is widened so that two pole pieces with their windings and two different armatures can be used. Alternatively, one magnet having coils' wound in the same direction, can beemployed, its two armatures being adapted to co-act with oppositely arranged break contacts.

Having thus described my invention, 1 claim as new and desire to secure by Letters Patent of the United States 1. The combination with a circuit to be controlled, of a source of alternating current, permanent relay magnets the windings of which are connected to said source of alternating current so that the poles of each electro-magnet are alternately the one strengthened and the other weakened by the succeeding half waves of alternating current flowing through the windings, movable contact members closing the circuit to be controlled in their rest position and constituting the armatures of said electromagmets, the

said armatures being positioned with regard to their contact pieces and the pole pieces of their respective magnets so as to be alternately the ones repelled from their contact pieces and the others attracted toward the same under the magnetic action of the pole pieces influenced bysucceeding halt waves of alternating current. flowing through the windings.

2. The. combination with a circuit to be controlled. of a source of alternating current, two polarized horse shoe relay magnets connected in series with the latterand having pole pieces of the same polarity, movable contact members closing the circuit to be controlled in their position ot' rest, and constituting the armaturcs of said elcctro-magnets, the said armatures being pivoted to the yoke of their respective magnets and biased in their position of rest by a spring toward pole pieces dili'erently influenced by the same halt Wave of alternating current.

3. An alternating current relay, comprising in combination, an alternating current circuit, a circuit to be controlled by said alternating current circuit, permanent magnets having coiled portions of said alternating current circuit about their polarized ends, vibratile armaturcs for said magnets connected in series with and forming part or the circuit to be controlled, which armatures in their normal position close said circuit to be controlled, but upon the flow of alternating current through the alternating current circuit, serve to break said circuit to be controlled and maintain it in open condition, while alternating current isflowing, substantially as set forth.-

Signed this 9th day of February, 1916.

FRITZ NOLTEn GOT 

